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Method for producing low freezing point biodiesel by employing waste animal and vegetable oil coupling and special device

A technology for discarding animals, plants and biodiesel, applied in the field of biodiesel preparation, can solve the problems of reducing biodiesel, unusable, complicated process, etc., and achieves the effect of reducing raw material cost, increasing reaction yield and good economy.

Inactive Publication Date: 2008-04-09
HUAZHONG AGRI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The common problems of biodiesel production methods at home and abroad are: complex process, excessive methanol used in the reaction process, complicated follow-up process, high energy consumption; water and free fatty acids in oil raw materials will seriously affect the yield of biodiesel and quality; complex product purification
People are looking for various catalysts and new technologies to study. For the currently widely used two-step method, first catalyzed by sulfuric acid, and then catalyzed by alkali, due to the presence of free fatty acids and traces of water in the reaction, saponification is generated, resulting in biodiesel low yield
Second, biodiesel produced by conventional processes has a high condensation point and cannot be used when the temperature is low. It is necessary to reduce the condensation point of biodiesel

Method used

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  • Method for producing low freezing point biodiesel by employing waste animal and vegetable oil coupling and special device
  • Method for producing low freezing point biodiesel by employing waste animal and vegetable oil coupling and special device
  • Method for producing low freezing point biodiesel by employing waste animal and vegetable oil coupling and special device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Raw materials: take 300 parts by weight of waste oil, and measure the acid value of the oil to be 146 mgKOH / g.

[0021] According to the technical route and device shown in accompanying drawings 1 and 2 of the specification and the technical steps and reaction conditions shown in the "Summary of the Invention" of this specification, the waste oil of this embodiment has been subjected to two major parts of thermal cracking and esterification. Put the 500mL three-necked bottle into the electric heating mantle, and install a thermal cracking tower, an electric stirrer and a thermometer successively on the there-necked bottle, then add 300 parts by weight of waste oil in the there-necked bottle, and put it under the condition of negative pressure (0.1MPa). Waste oil is heated to 200 ℃ to vaporize, and oil gas enters through pipeline and is equipped with solid cracking catalyst (adopts the molecular sieve impregnated and adsorbed ZnCl2, GaCl3 and fatty acid calcium, and this ...

Embodiment 2

[0028] With reference to the method and device of Example 1, the conditions in this example are as follows: Cottonseed acidified oil (acid value 192 mgKOH / g) produced in Xinjiang.

[0029] Raw materials in parts by weight: cottonseed acidified oil: 300 parts, sulfuric acid 2.4 parts, diisopropyl ether 45 parts, methanol 150 parts, solid cracking catalyst adopts impregnation adsorption ZnCl 2 , GaCl 3 and molecular sieves of fatty acid calcium salts (purchased from China Shanghai Petrochemical Catalyst Research Institute, model 5A). Obtain biodiesel: 226.3 parts, still residue: 52.2 parts.

[0030] The technical parameters of the reaction conditions are as follows: the reaction temperature is 65°C, the reaction time is 4h,

[0031] The acid value of the final product biodiesel was determined to be 0.85 mgKOH / g, and the actual freezing point of the final product biodiesel was -15°C. The conversion rate of biodiesel was 75.33%.

Embodiment 3

[0033] Preparation with reference to the method and device of Example 1.

[0034] Raw materials Raw materials are calculated in parts by weight: 300 parts of lard (acid value 6mgKOH / g), 4.5 parts of sulfuric acid, 35 parts of diisopropyl ether, 100 parts of methanol, and the solid cracking catalyst is impregnated with ZnCl 2 , GaCl 3 and fatty acid calcium molecular sieves.

[0035] The parameters of the reaction conditions are as follows: the reaction temperature is 70°C, the reaction time is 2h,

[0036] In this example, 239.3 parts of biodiesel and 47.2 parts of still residue were obtained. The acid value of the final product biodiesel was determined to be 0.5 mgKOH / g, and the actual freezing point of the final product biodiesel was -12°C. The conversion rate of biodiesel was 79.76%.

[0037] The comparison between the present invention and the existing method for the condensation point of biodiesel prepared from different feedstock oils is shown in Table 2.

[0038] Ta...

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Abstract

The invention pertains to the biological diesel preparation field, and in particular relates to a preparation method and a device for coupling production of low freezing point biological diesel by using waste animal and plant oil. The method is characterized in that: waste animal and plant oil with pH value of 6-192mgKOH / g is put into a reactor, heated and evaporated under 0.1 MPa to finish cracking reaction in the reactor; then alkane and fatty acid are obtained, which are put into a condenser to be added with methanol according to 6 to 10 mole ratio of alcohol / free fatty acid; 0.8 to 1.5 percent of concentrated sulfuric acid is added according to mass ratio of concentrated sulfate and oil; 10 to 20 percent of diisopropyl ether is added according to mass ratio of azeotropic distillation solvent and oil at 65 to 70 DEG C of the reaction temperature for 2 to 4 hours; after the reaction, the methanol is steamed out to be recycled; the separated upper oil phase is the biological diesel. Compared with the existing technique, the preparation method of the invention has low freezing point, low cost, and is in accordance with the technical direction of environment-friendly preparation.

Description

technical field [0001] The invention belongs to the technical field of biodiesel preparation, and in particular relates to a method for producing low freezing point biodiesel by cracking and esterifying coupling of waste animal and vegetable oils and a special device thereof. Background technique [0002] The common problems of biodiesel production methods at home and abroad are: complex process, excessive methanol used in the reaction process, complicated follow-up process, high energy consumption; water and free fatty acids in oil raw materials will seriously affect the yield of biodiesel and Quality; complex product purification. The application number is 02138523.8, which discloses a method for producing biodiesel from waste animal and vegetable oils with high acid value, which is characterized in that it adopts an acidic catalytic method, reacts with low-carbon alcohols under the action of an acidic catalyst, and passes through (1) dehydration (2) several steps such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 李庆陈守文李霞喻子牛
Owner HUAZHONG AGRI UNIV
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